I got a new lock for my front door the other day. I believe it's an ASSA Twin Combi 4800 series. The keyway looks really narrow (bottom right). I convinced the lock smith to let me keep my old cylinder, which is an older ASSA Twin Combi. The keyway on that one is very open, but I'm pretty sure there's a sidebar in there. So, now I have a real challenge on my hands

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Master keyed? Eww. 3D printer + Decoded cylinder/Dayton method equals access to every apartment...Hell, you probably wouldn't even need a 3D printer considering the simple profile. Just a piece of metal provided you have a key in the system to work the sidebar with...